Aurora Bearing Product Catalog 319

www.aurorabearing.com • Fax 630-859-0971 5 ULTIMATE RADIAL STATIC LOAD CAPACITY ROD ENDS The ultimate radial static load capacity is based upon the minimum mechanical properties of the design configuration in the stressed area. The ultimate radial static load capacity called out in the rod end specification charts is defined as a single cycle, unidirectional applied load to cause ultimate failure. Operating loads should be based on the static load ratings, incorporating appropriate safety factors to suit the application. When a rod end or spherical bearing is to be applied in full rotation, the surface speed of the ball should be kept below 20 feet per minute or the rotational speed should be below 100 RPM, whichever is lower, with the operating loads not to exceed 10% of the ultimate radial static load. Load ratings listed in the standard detail pages are applicable to rod ends supplied without grease fittings. Load ratings for units employing fittings may be affected due to lighter cross section in the stressed area. For information on the rod end radial static load ratings with fittings and other specific load rating information, consult the Aurora Bearing engineering department. AXIAL STATIC LOAD CAPACITY ROD ENDS Axial static load capacity is the force that is applied through the bore of the ball. For Aurora two-piece rod ends, maximum axial static load capacity is recommended to be 15 percent of the ultimate radial static load capacity. For three-piece rod ends, maximum axial static load capacity is generally recommended as 10 percent of ultimate radial static load capacity. It should be noted, however, that on three-piece units factors such as race material, body material and dimensions may affect axial static load capacity. For further information, consult the Aurora Bearing engineering department. RADIAL STATIC LIMIT LOAD CAPACITY SPHERICAL BEARINGS Unless otherwise noted, radial static loads are maximum static based on the maximum permanent set in the bearing race of 0.2% of the ball diameter. If greater permanent set can be allowed or if alternate race materials are used consult our engineering department for change factors. Operating loads are based on the radial static load rating and appropriate safety factors should be utilized to suit the application. Max axial load is recommended at 20 percent of the radial static load. Extreme care should be used on selecting a sufficiently strong housing to accept this type of bearing. BEARING MISALIGNMENT A rod end or spherical bearing’s ability to misalign is measured by the degree of angle the ball can accommodate without interference. The angle of misalignment in a rod end is limited by the ball width and head diameter as shown in figure 1. This arrangement is called a clevis mount, and is the type represented in the standard rod end detail pages. If added misalignment is necessary, this can be accomplished by utilizing spacers between the clevis mounting and ball face, or by using special rod ends designed to meet specific requirements. Misalignment angle in a spherical bearing is limited by the ball and race width with respect to the ball diameter, illustrated in figure 3. This is the mounting type represented in the standard detail pages for spherical bearings. Mounting arrangements for spherical bearings such as shown in figures 2 through 4 are also used with rod ends. The misalignment angle is then calculated by selecting the proper formula. ANGLE OF MISALIGNMENT a1 a1 FIGURE 1 FIGURE 3 FIGURE 2 a1 = Sin-1 W - Sin-1 H a2 = Sin-1 W - Sin-1 H FIGURE 4 a3 = Sin-1 W - Sin-1 H a2 a2 a3 a3 a4 a4 Reference Letters B - Ball Bore M - Outer Race Chamfer D - Head Diameter of Outer Race Diameter R - Ball Diameter H - Housing Width A - (D-2M)2 + H2 W - Ball Width D D A A R R a4 = Cos-1 B - Sin-1 H R R

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